【修复】centos定时任务python top不能输出

问题

用python监控进程占用服务器托管网硬件资源时，手动执行正常运行，定时任务执行出错
在centos的定时任务中，用python的os模块执行top命令时终端没有输出

cmd = 'top -d 1 -n 1 -p {} | grep -E "PID|{}|%Cpu|buff/cache" '.format(process_id, process_id, )
sys_out = os.popen(cmd)
sys_out = sys_out.read()

修复

1. top -n 1不能在 crontab中使用，要加一个参数top -b -n 1
2. 用 /bin/top 代替 top 命令

cmd = '/bin/top -b -d 1 -n 1 -p {} | grep -E "PID|{}|%Cpu|buff/cache" '.format(process_id, process_id, )

sys_out = os.popen(cmd)
sys_out = sys_out.read()  

引用

https://blog.51cto.com/zdz8207/3552214

源代码

def record_process_occupy(process_id=0, process_log_file="", ):
    """
    记录一条这个进程的资源占用情况
    :param process_id: 进程的ID
    :param log_file: 保存top输出的文件
    :return: None
    """

    cmd = '/bin/top -b -d 1 -n 1 -p {} | grep -E "PID|{}|%Cpu|buff/cache" '.format(process_id, process_id, )

    sys_out = os.popen(cmd)
    print(cmd)
    sys_out = sys_out.read()
    sys_out = sys_out.replace("x1b[7m", "")
    sys_out = sys_out.replace("x1b(Bx1b[mx1b[39;49mx1b(Bx1b[mx1b[39;49mx1b[K", "")
    sys_out = sys_ou服务器托管网t.replace("x1b(Bx1b[mx1b[39;49mx1b[K", "")
    sys_out = sys_out.replace("x1b(Bx1b[mx1b[39;49m", "")
    sys_out = sys_out.replace("x1b(Bx1b[m", '')
    sys_out = sys_out.replace("x1b[1m", "")
    sys_out = sys_out.split('n')

    assert len(sys_out) >= 4
    # print(sys_out)
    first_line = "time,"
    first_line += "us,sy,ni,id,wa,hi,si,st,"
    first_line += "total, free, used, buff/cache,"
    first_line += "PID,USER,PR,NI,VIRT,RES,SHR,S,%CPU,%MEM,TIME+,COMMAND"
    line = ",".join([
        datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
        ",".join([x for x in sys_out[0].replace(",", " ").split(" ") if x.replace(".", "").isdigit()]),  # cpu
        ",".join([x for x in sys_out[1].replace(",", " ").split(" ") if x.replace(".", "").isdigit()]),  # mem
        ",".join([x for x in sys_out[3].split(" ") if x]),  # 进程
    ])
    # print(first_line)
    # print(line)
    print("process_log_file", process_log_file)
    if not process_log_file:
        process_log_file = os.path.join(BACKUP_PATH, "process_{}_resource_occupy.csv".format(process_id))
        print()
    print("process_log_file:", process_log_file)
    is_new_file = not os.path.exists(process_log_file)
    with open(process_log_file, 'a') as f:
        if is_new_file:
            f.write(first_line + "n")
        f.write(line + "n")

    return True

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